Since I'm not a big Aperol fan, I made this with Bigallet China-China in lieu of that. I also added 2 ds of El Guapo Chicory-Pecan bitters instead of the Black Walnut. I liked the resulting drink, but found it a bit too sweet for my taste. I added something approaching 1/4 oz of Eda Rhyne Rustic Black Walnut Nocino (which is fairly bitter) and this brought the sweetness into perfect balance for my taste.